Buoyancy Force Acting on Underground Structures considering Seepage of Confined Water

Table 4

Measured and theoretical pore pressures and buoyancy forces acting on the structure placed on overlying aquiclude.

Test case	Hydraulic gradient	Measured pore pressure from ‘a’, (kPa)	Theoretical hydrostatic pore pressure, P0 (kPa)	Pore pressure raising ratio, /P0−1	Measured buoyancy force, F (N)	Theoretical hydrostatic buoyancy force, F0 (N)	Buoyancy force raising ratio, F/ F0−1
O4	0	2.945	3.0	−0.018	128	120	0.067
O5	0.125	3.724	3.0	0.241	152	120	0.267
O6	0.25	4.640	3.0	0.547	180	120	0.500